Very unusual CD 120 in this picture. Check out that extremely flat dome in comparison to the one on the left side. Not only that, but this one has RDP as well. I don't think these were intentionally meant to be RDP but they turned out that way, just very tiny nipples on the end of the drip indicating barely a pointed tip on the drill bit. One tiny thin clamshell on the WG lip in front and one larger chip to the rear WG lip.4 of the drips are lightly flaked. Embossing is (FS) PATENT DEC 19 1871 (RS) 5 / PATENT MAY 2 1893.This is an EID [070],just with round drips. The one on the left has normal SDP's and makes the right insulator look like a perfect RDP piece. More pix on req. First mail to me.... $23 delivered for the one on right. If you want left one, please contact me on it.